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Sodium thiosulfate

1. Chemcial name:Sodium thiosulfate
2. Structural formula:

3. Molecular formula: Na2S2O3·5H2O
4. Molecular weight: 248.17
5. Physical and chemical properties: monoclinic crystal, melting point: 40-45℃, relative density: 1.729(17℃).
6. Quality index:

Item
Photographic grade
Technical grade
Anhydrous grade
Appearance
colorless transparent crystal
colorless transparent crystal
white powder
Content
≥99.00%
≥98.5%
≥97.0%
Water insoluble matter
≤0.01%
≤0.03%
≤0.03%
Sulfide
≤0.001%
≤0.003%
≤0.001%
Iron
≤0.001%
≤0.003%
≤0.005%
PH value
6.5~9.5
6.5~9.5
6.5~9.5
Aqueous reaction
pass test
pass test
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Particle size
12~16
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7. Packing: 25kg, 50kg plastic woven bag, or at customer's request.
8. Uses: in fixing agent, electroplating, leather, reducing agent, dechlorinating agent, fading agent, and other industries.

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